JPS5717220A - Switched capacitor type filter device - Google Patents

Switched capacitor type filter device

Info

Publication number
JPS5717220A
JPS5717220A JP8108681A JP8108681A JPS5717220A JP S5717220 A JPS5717220 A JP S5717220A JP 8108681 A JP8108681 A JP 8108681A JP 8108681 A JP8108681 A JP 8108681A JP S5717220 A JPS5717220 A JP S5717220A
Authority
JP
Japan
Prior art keywords
switch
voltage
well region
well
noise
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP8108681A
Other languages
Japanese (ja)
Other versions
JPS632365B2 (en
Inventor
Toshiro Suzuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP8108681A priority Critical patent/JPS5717220A/en
Publication of JPS5717220A publication Critical patent/JPS5717220A/en
Publication of JPS632365B2 publication Critical patent/JPS632365B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H19/00—Networks using time-varying elements, e.g. N-path filters
    • H03H19/004—Switched capacitor networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Abstract

PURPOSE:To make noise low by forming a switching transistor in a well region of the surface of a semiconductor substrate. CONSTITUTION:A switch SW1 consisting of the 1st stage MOS transistor turns on when a pulse 0 is at ''1'' and a voltage at an input terminal IN is used to charge a transfer capacitor C1. This voltage is inputted to an operational amplifier A via a switch SW2 with a pulse (-phi) and an analog integral network is constituted as a whole. To reduce the power supply voltage noise mixed to a signal line B by parasitic capacitors Cso, Cs1, Cs2 formed to the switch transistors SW1, SW2, a switch transistor is formed in a well region of semiconductor substrate, and a stable voltage is applied to this well region after noise is rejected. That is, the well of the switch transistors SW1, SW2 is supplied from a regulated power supply 20 via a well potential generating circuit 21.
JP8108681A 1981-05-29 1981-05-29 Switched capacitor type filter device Granted JPS5717220A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8108681A JPS5717220A (en) 1981-05-29 1981-05-29 Switched capacitor type filter device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8108681A JPS5717220A (en) 1981-05-29 1981-05-29 Switched capacitor type filter device

Publications (2)

Publication Number Publication Date
JPS5717220A true JPS5717220A (en) 1982-01-28
JPS632365B2 JPS632365B2 (en) 1988-01-19

Family

ID=13736572

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8108681A Granted JPS5717220A (en) 1981-05-29 1981-05-29 Switched capacitor type filter device

Country Status (1)

Country Link
JP (1) JPS5717220A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58187015A (en) * 1982-04-26 1983-11-01 Nippon Telegr & Teleph Corp <Ntt> Switched capacitor circuit
JPS594314A (en) * 1982-06-30 1984-01-11 Fujitsu Ltd Switched capacitor filter
JPS59132218A (en) * 1983-01-19 1984-07-30 Oki Electric Ind Co Ltd Switched capacitor
US4743872A (en) * 1985-09-30 1988-05-10 Kabushiki Kaisha Toshiba Switched capacitor circuit
JPH04286415A (en) * 1991-03-15 1992-10-12 Nec Corp Switched capacitor filter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5126225A (en) * 1974-06-29 1976-03-04 Bayer Ag

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5126225A (en) * 1974-06-29 1976-03-04 Bayer Ag

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58187015A (en) * 1982-04-26 1983-11-01 Nippon Telegr & Teleph Corp <Ntt> Switched capacitor circuit
JPH0113766B2 (en) * 1982-04-26 1989-03-08 Nippon Telegraph & Telephone
JPS594314A (en) * 1982-06-30 1984-01-11 Fujitsu Ltd Switched capacitor filter
JPS59132218A (en) * 1983-01-19 1984-07-30 Oki Electric Ind Co Ltd Switched capacitor
US4743872A (en) * 1985-09-30 1988-05-10 Kabushiki Kaisha Toshiba Switched capacitor circuit
JPH04286415A (en) * 1991-03-15 1992-10-12 Nec Corp Switched capacitor filter

Also Published As

Publication number Publication date
JPS632365B2 (en) 1988-01-19

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